Stock Based Compensation - Plans - (Details) - shares	Apr. 30, 2016	Jan. 30, 2016
1987 Plan
Authorized And Available For Grant [Line Items]
Options And/Or Restrcited Stock Initially Authorized	5,850,000
Options And Or Restricted Stock Available For Grant	0	0
2004 Plan
Authorized And Available For Grant [Line Items]
Options And/Or Restrcited Stock Initially Authorized	1,350,000
Options And Or Restricted Stock Available For Grant	0	0
2013 Plan
Authorized And Available For Grant [Line Items]
Options And/Or Restrcited Stock Initially Authorized	1,500,000
Options And Or Restricted Stock Available For Grant	1,166,772	1,145,723